SD-R04A-T01 Rotary Encoder Switch | 4 Position 7.2×7.2mm SMD | for Access Control

SD-R04A-T01 Rotary Encoder Switch Product Overview

I. Product Positioning

The SD-R04A-T01 is a 4-position rotary encoder switch launched by BONSDA, featuring a 7.2×7.2mm Mini SMD package. It is designed to provide reliable coding setup solutions for access control devices and other space-constrained electronic equipment. As a proprietary brand product of Shenzhen Zigeng Technology Co., Ltd., the SD-R04A-T01 inherits BONSDA's technical expertise in the encoder switch field, meeting the stringent requirements of access control systems for coding components with its compact size, stable performance, and long-life design.

II. Design Features

1. Compact SMD Package, Suitable for High-Density Layouts

The SD-R04A-T01 adopts a 7.2×7.2mm Mini size and 4-pin SMD package. Compared to through-hole products, the SMD design is better suited to the high-density layout requirements of modern access control device motherboards. The SMD package supports reflow soldering, facilitating automated assembly production, which helps improve production efficiency and reduce assembly costs.

2. 4-Position Coding Setup, Intuitive Operation

The product provides 4-position coding output. Address codes or function codes can be set simply by rotating the knob. The mechanical detent locking at each position provides clear tactile feedback, preventing coding deviation caused by vibration or accidental touch, ensuring the accuracy and reliability of coding setup for access control devices.

3. Gold-Plated Contacts, Stable Signal

Both the contact sheet and terminals are gold-plated, with contact resistance as low as 60mΩ Max. This maintains stable signal transmission during long-term operation of access control devices, reducing coding read errors caused by poor contact.

4. Wide Temperature Design, Strong Environmental Adaptability

The operating temperature range covers -40℃ to +85℃. Whether for outdoor access control devices in cold regions or indoor controllers in high-temperature environments, the SD-R04A-T01 maintains stable electrical and mechanical performance.

5. Long Life, Meeting High-Frequency Operation Needs

Under a 100mA, 5V DC resistive load, the 0-3 position can complete 12,000 cycles, meeting the daily frequent coding setup and debugging needs of access control devices, reducing after-sales maintenance frequency.

III. Application Scenarios

The SD-R04A-T01 is mainly used in the access control device field, including:

Access Control Controllers: For device address code setting, supporting unique address configuration when multiple controllers are networked

Card Readers: For function mode switching and communication parameter setting

Turnstile/Gate Devices: For passage mode selection and device numbering

Elevator Control Systems: For floor permission coding setup

Security Integration Devices: For device identification code configuration in system integration

In addition to access control devices, the product can also be used in other electronic equipment requiring miniaturized coding setup, such as industrial control panels, communication equipment, and instrumentation.

IV. Summary

The SD-R04A-T01 rotary encoder switch, with its core advantages of 7.2×7.2mm SMD compact design, 4-position coding output, gold-plated contacts, wide temperature operating range, and 12,000-cycle service life, provides a reliable, durable, and automation-friendly coding setup solution for access control devices. Whether for access control controllers, card readers, or turnstile devices, the SD-R04A-T01 achieves stable and accurate coding configuration within limited space, making it a trustworthy component choice in access control system hardware design.

• Company Profile
• Factory
• Video
• Certificate
• Application
• Test equipment